Roy was always human, he never learned the art of boxing, basically boxing fundamentals. He was never fundamentally sound.

He got where he did cause he was more athletic than everyone in his era. He was bless with great physical gifts. But he never learned the fundamentals, he never learned defense. We all know as you get older you lose some of the physical gifts i.e.. speed and reflexes.

When he could no longer rely on his physical gifts due to age but mainly from dropping all that weight to get back to 175 to fight Tarver, He was just a normal guy in the ring.

Unlike Hopkins who relied on the fundamentals because he lacked the physical gifts that people like PBF still currently posses, Hopkins has been able to endure even in his older age.

Roy just was a great athlete that had good power. When he could no longer rely on his physical advantages he got exposed.